211120021 has 8 divisors (see below), whose sum is σ = 241807104. Its totient is φ = 180564720.

The previous prime is 211120009. The next prime is 211120033. The reversal of 211120021 is 120021112.

It is an interprime number because it is at equal distance from previous prime (211120009) and next prime (211120033).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211120021 - 2⁹ = 211119509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211120051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29485 + ... + 35938.

It is an arithmetic number, because the mean of its divisors is an integer number (30225888).

Almost surely, 2^211120021 is an apocalyptic number.

It is an amenable number.

211120021 is a deficient number, since it is larger than the sum of its proper divisors (30687083).

211120021 is an equidigital number, since it uses as much as digits as its factorization.

211120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65891.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 211120021 is about 14529.9697522053. The cubic root of 211120021 is about 595.4470392289.

Adding to 211120021 its reverse (120021112), we get a palindrome (331141133).

The spelling of 211120021 in words is "two hundred eleven million, one hundred twenty thousand, twenty-one".